Kind of urgent: I need to find the grammatically incorrect sentence, but can't [closed]

1. Yet, in the years since the late 1980s – with the exception of a brief spike during the Gulf War – gyrating oil prices have become a thing of the past.

The parenthetical is there to add extra information about the time and not about the prices and so it should be moved closer to what it describes.

2. The tower – built in Tokyo's eastern ward of Sumida – will replace the existing Tokyo Tower in 2012.

Apart from the illogicality of something that has already come into existence replacing something else only in the future, I would say that since the location of the tower is not the most important point of the sentence, em dashes are the stronger parenthetical mark and will serve to set this extraneous piece of information apart better.